Scatter Chart Axis as text in C# Web appl

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Pavr1 - 28 Mar 2005 17:21 GMT

Hi,
I've created a Scatter Chart in OWC11 in C# and the X axis must display
dates instead of numbers, I do it using the code below:

...
string x= "10/2/2004 12:00:00 AM\t10/2/2004 12:00:00 AM\t10/5/2004 12:00:00
AM\t10/5/2004 12:00:00 AM\t10/6/2004 12:00:00 AM\t10/7/2004 12:00:00
AM\t10/8/2004 12:00:00 AM\t";
string y = 1\t2\t76\t67\t....";

objChart.SeriesCollection[0].SetData(OWC11.ChartDimensionsEnum.chDimCategories,
(int)OWC11.ChartSpecialDataSourcesEnum.chDataLiteral, "Scatter Charts Series
1");
objChart.SeriesCollection[0].SetData
(OWC11.ChartDimensionsEnum.chDimXValues,
(int)OWC11.ChartSpecialDataSourcesEnum.chDataLiteral, x);
objChart.SeriesCollection[0].SetData(OWC11.ChartDimensionsEnum.chDimYValues,
(int)OWC11.ChartSpecialDataSourcesEnum.chDataLiteral, y);
...

whe I do this, somehow the X axis doesn't display the current dates in the
variable x and so the points position is wrong... so what I did is to change
the dates in the x variable into numbers. That way did work out but it didn't
display the dates in the x axis... (Example below)

...
x= "5\t7\t78\t23\t23\t85\t....";
y = 1\t2\t76\t67\t....";

objChart.SeriesCollection[0].SetData(OWC11.ChartDimensionsEnum.chDimCategories,
(int)OWC11.ChartSpecialDataSourcesEnum.chDataLiteral, "Scatter Charts Series
1");
objChart.SeriesCollection[0].SetData
(OWC11.ChartDimensionsEnum.chDimXValues,
(int)OWC11.ChartSpecialDataSourcesEnum.chDataLiteral, x);
objChart.SeriesCollection[0].SetData(OWC11.ChartDimensionsEnum.chDimYValues,
(int)OWC11.ChartSpecialDataSourcesEnum.chDataLiteral, y);
...

I have no clue about using a Scatter Chart with a date format axis... can
you please tell me any way to do that please?

pavr1

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Jon Peltier - 31 Mar 2005 05:28 GMT

I can't read French (I mean C#/OWC), so I don't know what a lot of your
post means, but I've included a few comments in line.

> Hi,
> I've created a Scatter Chart in OWC11 in C# and the X axis must display
[quoted text clipped - 24 lines]
> x= "5\t7\t78\t23\t23\t85\t....";
> y = 1\t2\t76\t67\t....";

Is this a funny way to write {5, 7, 78, 23, 23,...} ? I was thinking
that you might really have dates, but the number format was not set up
to display the numbers as dates. But these are not the dates that Excel
knows (I can't speak to OWC dates).

> objChart.SeriesCollection[0].SetData(OWC11.ChartDimensionsEnum.chDimCategories,
> (int)OWC11.ChartSpecialDataSourcesEnum.chDataLiteral, "Scatter Charts Series
[quoted text clipped - 8 lines]
> I have no clue about using a Scatter Chart with a date format axis... can
> you please tell me any way to do that please?

In Excel, a Scatter chart just has a numeric axis, but you can format
the numbers as dates. You can't get nice ticks at nonuniform spacing,
like the first of every month, because the major tick spacing must be
equal, and months don't work out that way. In Excel, you can use a Line
chart, which will give you a tick and a label at nonuniform places, like
1-Jan, 1-Feb, etc. This unfortunate nomenclature ("scatter" vs. "line")
confuses about 97% of Excel users, who think a line chart is for points
with connecting lines and a scatter chart is for points without
connecting lines; in reality the difference is between a numeric X axis
(scatter chart) or a category or time scale X axis (line chart).

- Jon
-------
Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
_______

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